Updated link to the documentation - docs.zendframework.com

Author: michalbundyra

README.md

@@ -12,7 +12,7 @@ component. The Service Locator is a service/object locator, tasked with
 retrieving other objects.
 
 - File issues at https://github.com/zendframework/zend-servicemanager/issues
-- [Online documentation](https://zendframework.github.io/zend-servicemanager)
+- [Online documentation](https://docs.zendframework.com/zend-servicemanager)
 - [Documentation source files](doc/book/)
 
 ## Benchmarks